The Bug

Unlike any potion, splash potion, lingering potion or tipped arrow (outside of the ones with instant effects), the spectral arrow shows no duration of the potion effect, nor that it gives an effect.

Steps to Reproduce

• Give yourself a spectral arrow.

  /give @s minecraft:spectral_arrow
  

• Open your inventory and hold your mouse cursor over it to display the item's tooltip.
• Look at the item's lore closely.

Observed Behavior

Spectral arrows do not display their potion effect along with its duration in its item's lore.

Expected Behavior

Spectral arrows would display their potion effect along with its duration in its item's lore.

Code Analysis

Code analysis by bemoty can be found in this comment.